( function () {

	class ColladaLoader extends THREE.Loader {

		constructor( manager ) {

			super( manager );

		}

		load( url, onLoad, onProgress, onError ) {

			const scope = this;
			const path = scope.path === '' ? THREE.LoaderUtils.extractUrlBase( url ) : scope.path;
			const loader = new THREE.FileLoader( scope.manager );
			loader.setPath( scope.path );
			loader.setRequestHeader( scope.requestHeader );
			loader.setWithCredentials( scope.withCredentials );
			loader.load( url, function ( text ) {

				try {

					onLoad( scope.parse( text, path ) );

				} catch ( e ) {

					if ( onError ) {

						onError( e );

					} else {

						console.error( e );

					}

					scope.manager.itemError( url );

				}

			}, onProgress, onError );

		}

		parse( text, path ) {

			function getElementsByTagName( xml, name ) {

				// Non recursive xml.getElementsByTagName() ...
				const array = [];
				const childNodes = xml.childNodes;

				for ( let i = 0, l = childNodes.length; i < l; i ++ ) {

					const child = childNodes[ i ];

					if ( child.nodeName === name ) {

						array.push( child );

					}

				}

				return array;

			}

			function parseStrings( text ) {

				if ( text.length === 0 ) return [];
				const parts = text.trim().split( /\s+/ );
				const array = new Array( parts.length );

				for ( let i = 0, l = parts.length; i < l; i ++ ) {

					array[ i ] = parts[ i ];

				}

				return array;

			}

			function parseFloats( text ) {

				if ( text.length === 0 ) return [];
				const parts = text.trim().split( /\s+/ );
				const array = new Array( parts.length );

				for ( let i = 0, l = parts.length; i < l; i ++ ) {

					array[ i ] = parseFloat( parts[ i ] );

				}

				return array;

			}

			function parseInts( text ) {

				if ( text.length === 0 ) return [];
				const parts = text.trim().split( /\s+/ );
				const array = new Array( parts.length );

				for ( let i = 0, l = parts.length; i < l; i ++ ) {

					array[ i ] = parseInt( parts[ i ] );

				}

				return array;

			}

			function parseId( text ) {

				return text.substring( 1 );

			}

			function generateId() {

				return 'three_default_' + count ++;

			}

			function isEmpty( object ) {

				return Object.keys( object ).length === 0;

			} // asset


			function parseAsset( xml ) {

				return {
					unit: parseAssetUnit( getElementsByTagName( xml, 'unit' )[ 0 ] ),
					upAxis: parseAssetUpAxis( getElementsByTagName( xml, 'up_axis' )[ 0 ] )
				};

			}

			function parseAssetUnit( xml ) {

				if ( xml !== undefined && xml.hasAttribute( 'meter' ) === true ) {

					return parseFloat( xml.getAttribute( 'meter' ) );

				} else {

					return 1; // default 1 meter

				}

			}

			function parseAssetUpAxis( xml ) {

				return xml !== undefined ? xml.textContent : 'Y_UP';

			} // library


			function parseLibrary( xml, libraryName, nodeName, parser ) {

				const library = getElementsByTagName( xml, libraryName )[ 0 ];

				if ( library !== undefined ) {

					const elements = getElementsByTagName( library, nodeName );

					for ( let i = 0; i < elements.length; i ++ ) {

						parser( elements[ i ] );

					}

				}

			}

			function buildLibrary( data, builder ) {

				for ( const name in data ) {

					const object = data[ name ];
					object.build = builder( data[ name ] );

				}

			} // get


			function getBuild( data, builder ) {

				if ( data.build !== undefined ) return data.build;
				data.build = builder( data );
				return data.build;

			} // animation


			function parseAnimation( xml ) {

				const data = {
					sources: {},
					samplers: {},
					channels: {}
				};
				let hasChildren = false;

				for ( let i = 0, l = xml.childNodes.length; i < l; i ++ ) {

					const child = xml.childNodes[ i ];
					if ( child.nodeType !== 1 ) continue;
					let id;

					switch ( child.nodeName ) {

						case 'source':
							id = child.getAttribute( 'id' );
							data.sources[ id ] = parseSource( child );
							break;

						case 'sampler':
							id = child.getAttribute( 'id' );
							data.samplers[ id ] = parseAnimationSampler( child );
							break;

						case 'channel':
							id = child.getAttribute( 'target' );
							data.channels[ id ] = parseAnimationChannel( child );
							break;

						case 'animation':
							// hierarchy of related animations
							parseAnimation( child );
							hasChildren = true;
							break;

						default:
							console.log( child );

					}

				}

				if ( hasChildren === false ) {

					// since 'id' attributes can be optional, it's necessary to generate a UUID for unqiue assignment
					library.animations[ xml.getAttribute( 'id' ) || THREE.MathUtils.generateUUID() ] = data;

				}

			}

			function parseAnimationSampler( xml ) {

				const data = {
					inputs: {}
				};

				for ( let i = 0, l = xml.childNodes.length; i < l; i ++ ) {

					const child = xml.childNodes[ i ];
					if ( child.nodeType !== 1 ) continue;

					switch ( child.nodeName ) {

						case 'input':
							const id = parseId( child.getAttribute( 'source' ) );
							const semantic = child.getAttribute( 'semantic' );
							data.inputs[ semantic ] = id;
							break;

					}

				}

				return data;

			}

			function parseAnimationChannel( xml ) {

				const data = {};
				const target = xml.getAttribute( 'target' ); // parsing SID Addressing Syntax

				let parts = target.split( '/' );
				const id = parts.shift();
				let sid = parts.shift(); // check selection syntax

				const arraySyntax = sid.indexOf( '(' ) !== - 1;
				const memberSyntax = sid.indexOf( '.' ) !== - 1;

				if ( memberSyntax ) {

					//  member selection access
					parts = sid.split( '.' );
					sid = parts.shift();
					data.member = parts.shift();

				} else if ( arraySyntax ) {

					// array-access syntax. can be used to express fields in one-dimensional vectors or two-dimensional matrices.
					const indices = sid.split( '(' );
					sid = indices.shift();

					for ( let i = 0; i < indices.length; i ++ ) {

						indices[ i ] = parseInt( indices[ i ].replace( /\)/, '' ) );

					}

					data.indices = indices;

				}

				data.id = id;
				data.sid = sid;
				data.arraySyntax = arraySyntax;
				data.memberSyntax = memberSyntax;
				data.sampler = parseId( xml.getAttribute( 'source' ) );
				return data;

			}

			function buildAnimation( data ) {

				const tracks = [];
				const channels = data.channels;
				const samplers = data.samplers;
				const sources = data.sources;

				for ( const target in channels ) {

					if ( channels.hasOwnProperty( target ) ) {

						const channel = channels[ target ];
						const sampler = samplers[ channel.sampler ];
						const inputId = sampler.inputs.INPUT;
						const outputId = sampler.inputs.OUTPUT;
						const inputSource = sources[ inputId ];
						const outputSource = sources[ outputId ];
						const animation = buildAnimationChannel( channel, inputSource, outputSource );
						createKeyframeTracks( animation, tracks );

					}

				}

				return tracks;

			}

			function getAnimation( id ) {

				return getBuild( library.animations[ id ], buildAnimation );

			}

			function buildAnimationChannel( channel, inputSource, outputSource ) {

				const node = library.nodes[ channel.id ];
				const object3D = getNode( node.id );
				const transform = node.transforms[ channel.sid ];
				const defaultMatrix = node.matrix.clone().transpose();
				let time, stride;
				let i, il, j, jl;
				const data = {}; // the collada spec allows the animation of data in various ways.
				// depending on the transform type (matrix, translate, rotate, scale), we execute different logic

				switch ( transform ) {

					case 'matrix':
						for ( i = 0, il = inputSource.array.length; i < il; i ++ ) {

							time = inputSource.array[ i ];
							stride = i * outputSource.stride;
							if ( data[ time ] === undefined ) data[ time ] = {};

							if ( channel.arraySyntax === true ) {

								const value = outputSource.array[ stride ];
								const index = channel.indices[ 0 ] + 4 * channel.indices[ 1 ];
								data[ time ][ index ] = value;

							} else {

								for ( j = 0, jl = outputSource.stride; j < jl; j ++ ) {

									data[ time ][ j ] = outputSource.array[ stride + j ];

								}

							}

						}

						break;

					case 'translate':
						console.warn( 'THREE.ColladaLoader: Animation transform type "%s" not yet implemented.', transform );
						break;

					case 'rotate':
						console.warn( 'THREE.ColladaLoader: Animation transform type "%s" not yet implemented.', transform );
						break;

					case 'scale':
						console.warn( 'THREE.ColladaLoader: Animation transform type "%s" not yet implemented.', transform );
						break;

				}

				const keyframes = prepareAnimationData( data, defaultMatrix );
				const animation = {
					name: object3D.uuid,
					keyframes: keyframes
				};
				return animation;

			}

			function prepareAnimationData( data, defaultMatrix ) {

				const keyframes = []; // transfer data into a sortable array

				for ( const time in data ) {

					keyframes.push( {
						time: parseFloat( time ),
						value: data[ time ]
					} );

				} // ensure keyframes are sorted by time


				keyframes.sort( ascending ); // now we clean up all animation data, so we can use them for keyframe tracks

				for ( let i = 0; i < 16; i ++ ) {

					transformAnimationData( keyframes, i, defaultMatrix.elements[ i ] );

				}

				return keyframes; // array sort function

				function ascending( a, b ) {

					return a.time - b.time;

				}

			}

			const position = new THREE.Vector3();
			const scale = new THREE.Vector3();
			const quaternion = new THREE.Quaternion();

			function createKeyframeTracks( animation, tracks ) {

				const keyframes = animation.keyframes;
				const name = animation.name;
				const times = [];
				const positionData = [];
				const quaternionData = [];
				const scaleData = [];

				for ( let i = 0, l = keyframes.length; i < l; i ++ ) {

					const keyframe = keyframes[ i ];
					const time = keyframe.time;
					const value = keyframe.value;
					matrix.fromArray( value ).transpose();
					matrix.decompose( position, quaternion, scale );
					times.push( time );
					positionData.push( position.x, position.y, position.z );
					quaternionData.push( quaternion.x, quaternion.y, quaternion.z, quaternion.w );
					scaleData.push( scale.x, scale.y, scale.z );

				}

				if ( positionData.length > 0 ) tracks.push( new THREE.VectorKeyframeTrack( name + '.position', times, positionData ) );
				if ( quaternionData.length > 0 ) tracks.push( new THREE.QuaternionKeyframeTrack( name + '.quaternion', times, quaternionData ) );
				if ( scaleData.length > 0 ) tracks.push( new THREE.VectorKeyframeTrack( name + '.scale', times, scaleData ) );
				return tracks;

			}

			function transformAnimationData( keyframes, property, defaultValue ) {

				let keyframe;
				let empty = true;
				let i, l; // check, if values of a property are missing in our keyframes

				for ( i = 0, l = keyframes.length; i < l; i ++ ) {

					keyframe = keyframes[ i ];

					if ( keyframe.value[ property ] === undefined ) {

						keyframe.value[ property ] = null; // mark as missing

					} else {

						empty = false;

					}

				}

				if ( empty === true ) {

					// no values at all, so we set a default value
					for ( i = 0, l = keyframes.length; i < l; i ++ ) {

						keyframe = keyframes[ i ];
						keyframe.value[ property ] = defaultValue;

					}

				} else {

					// filling gaps
					createMissingKeyframes( keyframes, property );

				}

			}

			function createMissingKeyframes( keyframes, property ) {

				let prev, next;

				for ( let i = 0, l = keyframes.length; i < l; i ++ ) {

					const keyframe = keyframes[ i ];

					if ( keyframe.value[ property ] === null ) {

						prev = getPrev( keyframes, i, property );
						next = getNext( keyframes, i, property );

						if ( prev === null ) {

							keyframe.value[ property ] = next.value[ property ];
							continue;

						}

						if ( next === null ) {

							keyframe.value[ property ] = prev.value[ property ];
							continue;

						}

						interpolate( keyframe, prev, next, property );

					}

				}

			}

			function getPrev( keyframes, i, property ) {

				while ( i >= 0 ) {

					const keyframe = keyframes[ i ];
					if ( keyframe.value[ property ] !== null ) return keyframe;
					i --;

				}

				return null;

			}

			function getNext( keyframes, i, property ) {

				while ( i < keyframes.length ) {

					const keyframe = keyframes[ i ];
					if ( keyframe.value[ property ] !== null ) return keyframe;
					i ++;

				}

				return null;

			}

			function interpolate( key, prev, next, property ) {

				if ( next.time - prev.time === 0 ) {

					key.value[ property ] = prev.value[ property ];
					return;

				}

				key.value[ property ] = ( key.time - prev.time ) * ( next.value[ property ] - prev.value[ property ] ) / ( next.time - prev.time ) + prev.value[ property ];

			} // animation clips


			function parseAnimationClip( xml ) {

				const data = {
					name: xml.getAttribute( 'id' ) || 'default',
					start: parseFloat( xml.getAttribute( 'start' ) || 0 ),
					end: parseFloat( xml.getAttribute( 'end' ) || 0 ),
					animations: []
				};

				for ( let i = 0, l = xml.childNodes.length; i < l; i ++ ) {

					const child = xml.childNodes[ i ];
					if ( child.nodeType !== 1 ) continue;

					switch ( child.nodeName ) {

						case 'instance_animation':
							data.animations.push( parseId( child.getAttribute( 'url' ) ) );
							break;

					}

				}

				library.clips[ xml.getAttribute( 'id' ) ] = data;

			}

			function buildAnimationClip( data ) {

				const tracks = [];
				const name = data.name;
				const duration = data.end - data.start || - 1;
				const animations = data.animations;

				for ( let i = 0, il = animations.length; i < il; i ++ ) {

					const animationTracks = getAnimation( animations[ i ] );

					for ( let j = 0, jl = animationTracks.length; j < jl; j ++ ) {

						tracks.push( animationTracks[ j ] );

					}

				}

				return new THREE.AnimationClip( name, duration, tracks );

			}

			function getAnimationClip( id ) {

				return getBuild( library.clips[ id ], buildAnimationClip );

			} // controller


			function parseController( xml ) {

				const data = {};

				for ( let i = 0, l = xml.childNodes.length; i < l; i ++ ) {

					const child = xml.childNodes[ i ];
					if ( child.nodeType !== 1 ) continue;

					switch ( child.nodeName ) {

						case 'skin':
							// there is exactly one skin per controller
							data.id = parseId( child.getAttribute( 'source' ) );
							data.skin = parseSkin( child );
							break;

						case 'morph':
							data.id = parseId( child.getAttribute( 'source' ) );
							console.warn( 'THREE.ColladaLoader: Morph target animation not supported yet.' );
							break;

					}

				}

				library.controllers[ xml.getAttribute( 'id' ) ] = data;

			}

			function parseSkin( xml ) {

				const data = {
					sources: {}
				};

				for ( let i = 0, l = xml.childNodes.length; i < l; i ++ ) {

					const child = xml.childNodes[ i ];
					if ( child.nodeType !== 1 ) continue;

					switch ( child.nodeName ) {

						case 'bind_shape_matrix':
							data.bindShapeMatrix = parseFloats( child.textContent );
							break;

						case 'source':
							const id = child.getAttribute( 'id' );
							data.sources[ id ] = parseSource( child );
							break;

						case 'joints':
							data.joints = parseJoints( child );
							break;

						case 'vertex_weights':
							data.vertexWeights = parseVertexWeights( child );
							break;

					}

				}

				return data;

			}

			function parseJoints( xml ) {

				const data = {
					inputs: {}
				};

				for ( let i = 0, l = xml.childNodes.length; i < l; i ++ ) {

					const child = xml.childNodes[ i ];
					if ( child.nodeType !== 1 ) continue;

					switch ( child.nodeName ) {

						case 'input':
							const semantic = child.getAttribute( 'semantic' );
							const id = parseId( child.getAttribute( 'source' ) );
							data.inputs[ semantic ] = id;
							break;

					}

				}

				return data;

			}

			function parseVertexWeights( xml ) {

				const data = {
					inputs: {}
				};

				for ( let i = 0, l = xml.childNodes.length; i < l; i ++ ) {

					const child = xml.childNodes[ i ];
					if ( child.nodeType !== 1 ) continue;

					switch ( child.nodeName ) {

						case 'input':
							const semantic = child.getAttribute( 'semantic' );
							const id = parseId( child.getAttribute( 'source' ) );
							const offset = parseInt( child.getAttribute( 'offset' ) );
							data.inputs[ semantic ] = {
								id: id,
								offset: offset
							};
							break;

						case 'vcount':
							data.vcount = parseInts( child.textContent );
							break;

						case 'v':
							data.v = parseInts( child.textContent );
							break;

					}

				}

				return data;

			}

			function buildController( data ) {

				const build = {
					id: data.id
				};
				const geometry = library.geometries[ build.id ];

				if ( data.skin !== undefined ) {

					build.skin = buildSkin( data.skin ); // we enhance the 'sources' property of the corresponding geometry with our skin data

					geometry.sources.skinIndices = build.skin.indices;
					geometry.sources.skinWeights = build.skin.weights;

				}

				return build;

			}

			function buildSkin( data ) {

				const BONE_LIMIT = 4;
				const build = {
					joints: [],
					// this must be an array to preserve the joint order
					indices: {
						array: [],
						stride: BONE_LIMIT
					},
					weights: {
						array: [],
						stride: BONE_LIMIT
					}
				};
				const sources = data.sources;
				const vertexWeights = data.vertexWeights;
				const vcount = vertexWeights.vcount;
				const v = vertexWeights.v;
				const jointOffset = vertexWeights.inputs.JOINT.offset;
				const weightOffset = vertexWeights.inputs.WEIGHT.offset;
				const jointSource = data.sources[ data.joints.inputs.JOINT ];
				const inverseSource = data.sources[ data.joints.inputs.INV_BIND_MATRIX ];
				const weights = sources[ vertexWeights.inputs.WEIGHT.id ].array;
				let stride = 0;
				let i, j, l; // procces skin data for each vertex

				for ( i = 0, l = vcount.length; i < l; i ++ ) {

					const jointCount = vcount[ i ]; // this is the amount of joints that affect a single vertex

					const vertexSkinData = [];

					for ( j = 0; j < jointCount; j ++ ) {

						const skinIndex = v[ stride + jointOffset ];
						const weightId = v[ stride + weightOffset ];
						const skinWeight = weights[ weightId ];
						vertexSkinData.push( {
							index: skinIndex,
							weight: skinWeight
						} );
						stride += 2;

					} // we sort the joints in descending order based on the weights.
					// this ensures, we only procced the most important joints of the vertex


					vertexSkinData.sort( descending ); // now we provide for each vertex a set of four index and weight values.
					// the order of the skin data matches the order of vertices

					for ( j = 0; j < BONE_LIMIT; j ++ ) {

						const d = vertexSkinData[ j ];

						if ( d !== undefined ) {

							build.indices.array.push( d.index );
							build.weights.array.push( d.weight );

						} else {

							build.indices.array.push( 0 );
							build.weights.array.push( 0 );

						}

					}

				} // setup bind matrix


				if ( data.bindShapeMatrix ) {

					build.bindMatrix = new THREE.Matrix4().fromArray( data.bindShapeMatrix ).transpose();

				} else {

					build.bindMatrix = new THREE.Matrix4().identity();

				} // process bones and inverse bind matrix data


				for ( i = 0, l = jointSource.array.length; i < l; i ++ ) {

					const name = jointSource.array[ i ];
					const boneInverse = new THREE.Matrix4().fromArray( inverseSource.array, i * inverseSource.stride ).transpose();
					build.joints.push( {
						name: name,
						boneInverse: boneInverse
					} );

				}

				return build; // array sort function

				function descending( a, b ) {

					return b.weight - a.weight;

				}

			}

			function getController( id ) {

				return getBuild( library.controllers[ id ], buildController );

			} // image


			function parseImage( xml ) {

				const data = {
					init_from: getElementsByTagName( xml, 'init_from' )[ 0 ].textContent
				};
				library.images[ xml.getAttribute( 'id' ) ] = data;

			}

			function buildImage( data ) {

				if ( data.build !== undefined ) return data.build;
				return data.init_from;

			}

			function getImage( id ) {

				const data = library.images[ id ];

				if ( data !== undefined ) {

					return getBuild( data, buildImage );

				}

				console.warn( 'THREE.ColladaLoader: Couldn\'t find image with ID:', id );
				return null;

			} // effect


			function parseEffect( xml ) {

				const data = {};

				for ( let i = 0, l = xml.childNodes.length; i < l; i ++ ) {

					const child = xml.childNodes[ i ];
					if ( child.nodeType !== 1 ) continue;

					switch ( child.nodeName ) {

						case 'profile_COMMON':
							data.profile = parseEffectProfileCOMMON( child );
							break;

					}

				}

				library.effects[ xml.getAttribute( 'id' ) ] = data;

			}

			function parseEffectProfileCOMMON( xml ) {

				const data = {
					surfaces: {},
					samplers: {}
				};

				for ( let i = 0, l = xml.childNodes.length; i < l; i ++ ) {

					const child = xml.childNodes[ i ];
					if ( child.nodeType !== 1 ) continue;

					switch ( child.nodeName ) {

						case 'newparam':
							parseEffectNewparam( child, data );
							break;

						case 'technique':
							data.technique = parseEffectTechnique( child );
							break;

						case 'extra':
							data.extra = parseEffectExtra( child );
							break;

					}

				}

				return data;

			}

			function parseEffectNewparam( xml, data ) {

				const sid = xml.getAttribute( 'sid' );

				for ( let i = 0, l = xml.childNodes.length; i < l; i ++ ) {

					const child = xml.childNodes[ i ];
					if ( child.nodeType !== 1 ) continue;

					switch ( child.nodeName ) {

						case 'surface':
							data.surfaces[ sid ] = parseEffectSurface( child );
							break;

						case 'sampler2D':
							data.samplers[ sid ] = parseEffectSampler( child );
							break;

					}

				}

			}

			function parseEffectSurface( xml ) {

				const data = {};

				for ( let i = 0, l = xml.childNodes.length; i < l; i ++ ) {

					const child = xml.childNodes[ i ];
					if ( child.nodeType !== 1 ) continue;

					switch ( child.nodeName ) {

						case 'init_from':
							data.init_from = child.textContent;
							break;

					}

				}

				return data;

			}

			function parseEffectSampler( xml ) {

				const data = {};

				for ( let i = 0, l = xml.childNodes.length; i < l; i ++ ) {

					const child = xml.childNodes[ i ];
					if ( child.nodeType !== 1 ) continue;

					switch ( child.nodeName ) {

						case 'source':
							data.source = child.textContent;
							break;

					}

				}

				return data;

			}

			function parseEffectTechnique( xml ) {

				const data = {};

				for ( let i = 0, l = xml.childNodes.length; i < l; i ++ ) {

					const child = xml.childNodes[ i ];
					if ( child.nodeType !== 1 ) continue;

					switch ( child.nodeName ) {

						case 'constant':
						case 'lambert':
						case 'blinn':
						case 'phong':
							data.type = child.nodeName;
							data.parameters = parseEffectParameters( child );
							break;

					}

				}

				return data;

			}

			function parseEffectParameters( xml ) {

				const data = {};

				for ( let i = 0, l = xml.childNodes.length; i < l; i ++ ) {

					const child = xml.childNodes[ i ];
					if ( child.nodeType !== 1 ) continue;

					switch ( child.nodeName ) {

						case 'emission':
						case 'diffuse':
						case 'specular':
						case 'bump':
						case 'ambient':
						case 'shininess':
						case 'transparency':
							data[ child.nodeName ] = parseEffectParameter( child );
							break;

						case 'transparent':
							data[ child.nodeName ] = {
								opaque: child.getAttribute( 'opaque' ),
								data: parseEffectParameter( child )
							};
							break;

					}

				}

				return data;

			}

			function parseEffectParameter( xml ) {

				const data = {};

				for ( let i = 0, l = xml.childNodes.length; i < l; i ++ ) {

					const child = xml.childNodes[ i ];
					if ( child.nodeType !== 1 ) continue;

					switch ( child.nodeName ) {

						case 'color':
							data[ child.nodeName ] = parseFloats( child.textContent );
							break;

						case 'float':
							data[ child.nodeName ] = parseFloat( child.textContent );
							break;

						case 'texture':
							data[ child.nodeName ] = {
								id: child.getAttribute( 'texture' ),
								extra: parseEffectParameterTexture( child )
							};
							break;

					}

				}

				return data;

			}

			function parseEffectParameterTexture( xml ) {

				const data = {
					technique: {}
				};

				for ( let i = 0, l = xml.childNodes.length; i < l; i ++ ) {

					const child = xml.childNodes[ i ];
					if ( child.nodeType !== 1 ) continue;

					switch ( child.nodeName ) {

						case 'extra':
							parseEffectParameterTextureExtra( child, data );
							break;

					}

				}

				return data;

			}

			function parseEffectParameterTextureExtra( xml, data ) {

				for ( let i = 0, l = xml.childNodes.length; i < l; i ++ ) {

					const child = xml.childNodes[ i ];
					if ( child.nodeType !== 1 ) continue;

					switch ( child.nodeName ) {

						case 'technique':
							parseEffectParameterTextureExtraTechnique( child, data );
							break;

					}

				}

			}

			function parseEffectParameterTextureExtraTechnique( xml, data ) {

				for ( let i = 0, l = xml.childNodes.length; i < l; i ++ ) {

					const child = xml.childNodes[ i ];
					if ( child.nodeType !== 1 ) continue;

					switch ( child.nodeName ) {

						case 'repeatU':
						case 'repeatV':
						case 'offsetU':
						case 'offsetV':
							data.technique[ child.nodeName ] = parseFloat( child.textContent );
							break;

						case 'wrapU':
						case 'wrapV':
							// some files have values for wrapU/wrapV which become NaN via parseInt
							if ( child.textContent.toUpperCase() === 'TRUE' ) {

								data.technique[ child.nodeName ] = 1;

							} else if ( child.textContent.toUpperCase() === 'FALSE' ) {

								data.technique[ child.nodeName ] = 0;

							} else {

								data.technique[ child.nodeName ] = parseInt( child.textContent );

							}

							break;

					}

				}

			}

			function parseEffectExtra( xml ) {

				const data = {};

				for ( let i = 0, l = xml.childNodes.length; i < l; i ++ ) {

					const child = xml.childNodes[ i ];
					if ( child.nodeType !== 1 ) continue;

					switch ( child.nodeName ) {

						case 'technique':
							data.technique = parseEffectExtraTechnique( child );
							break;

					}

				}

				return data;

			}

			function parseEffectExtraTechnique( xml ) {

				const data = {};

				for ( let i = 0, l = xml.childNodes.length; i < l; i ++ ) {

					const child = xml.childNodes[ i ];
					if ( child.nodeType !== 1 ) continue;

					switch ( child.nodeName ) {

						case 'double_sided':
							data[ child.nodeName ] = parseInt( child.textContent );
							break;

					}

				}

				return data;

			}

			function buildEffect( data ) {

				return data;

			}

			function getEffect( id ) {

				return getBuild( library.effects[ id ], buildEffect );

			} // material


			function parseMaterial( xml ) {

				const data = {
					name: xml.getAttribute( 'name' )
				};

				for ( let i = 0, l = xml.childNodes.length; i < l; i ++ ) {

					const child = xml.childNodes[ i ];
					if ( child.nodeType !== 1 ) continue;

					switch ( child.nodeName ) {

						case 'instance_effect':
							data.url = parseId( child.getAttribute( 'url' ) );
							break;

					}

				}

				library.materials[ xml.getAttribute( 'id' ) ] = data;

			}

			function getTextureLoader( image ) {

				let loader;
				let extension = image.slice( ( image.lastIndexOf( '.' ) - 1 >>> 0 ) + 2 ); // http://www.jstips.co/en/javascript/get-file-extension/

				extension = extension.toLowerCase();

				switch ( extension ) {

					case 'tga':
						loader = tgaLoader;
						break;

					default:
						loader = textureLoader;

				}

				return loader;

			}

			function buildMaterial( data ) {

				const effect = getEffect( data.url );
				const technique = effect.profile.technique;
				const extra = effect.profile.extra;
				let material;

				switch ( technique.type ) {

					case 'phong':
					case 'blinn':
						material = new THREE.MeshPhongMaterial();
						break;

					case 'lambert':
						material = new THREE.MeshLambertMaterial();
						break;

					default:
						material = new THREE.MeshBasicMaterial();
						break;

				}

				material.name = data.name || '';

				function getTexture( textureObject ) {

					const sampler = effect.profile.samplers[ textureObject.id ];
					let image = null; // get image

					if ( sampler !== undefined ) {

						const surface = effect.profile.surfaces[ sampler.source ];
						image = getImage( surface.init_from );

					} else {

						console.warn( 'THREE.ColladaLoader: Undefined sampler. Access image directly (see #12530).' );
						image = getImage( textureObject.id );

					} // create texture if image is avaiable


					if ( image !== null ) {

						const loader = getTextureLoader( image );

						if ( loader !== undefined ) {

							const texture = loader.load( image );
							const extra = textureObject.extra;

							if ( extra !== undefined && extra.technique !== undefined && isEmpty( extra.technique ) === false ) {

								const technique = extra.technique;
								texture.wrapS = technique.wrapU ? THREE.RepeatWrapping : THREE.ClampToEdgeWrapping;
								texture.wrapT = technique.wrapV ? THREE.RepeatWrapping : THREE.ClampToEdgeWrapping;
								texture.offset.set( technique.offsetU || 0, technique.offsetV || 0 );
								texture.repeat.set( technique.repeatU || 1, technique.repeatV || 1 );

							} else {

								texture.wrapS = THREE.RepeatWrapping;
								texture.wrapT = THREE.RepeatWrapping;

							}

							return texture;

						} else {

							console.warn( 'THREE.ColladaLoader: THREE.Loader for texture %s not found.', image );
							return null;

						}

					} else {

						console.warn( 'THREE.ColladaLoader: Couldn\'t create texture with ID:', textureObject.id );
						return null;

					}

				}

				const parameters = technique.parameters;

				for ( const key in parameters ) {

					const parameter = parameters[ key ];

					switch ( key ) {

						case 'diffuse':
							if ( parameter.color ) material.color.fromArray( parameter.color );
							if ( parameter.texture ) material.map = getTexture( parameter.texture );
							break;

						case 'specular':
							if ( parameter.color && material.specular ) material.specular.fromArray( parameter.color );
							if ( parameter.texture ) material.specularMap = getTexture( parameter.texture );
							break;

						case 'bump':
							if ( parameter.texture ) material.normalMap = getTexture( parameter.texture );
							break;

						case 'ambient':
							if ( parameter.texture ) material.lightMap = getTexture( parameter.texture );
							break;

						case 'shininess':
							if ( parameter.float && material.shininess ) material.shininess = parameter.float;
							break;

						case 'emission':
							if ( parameter.color && material.emissive ) material.emissive.fromArray( parameter.color );
							if ( parameter.texture ) material.emissiveMap = getTexture( parameter.texture );
							break;

					}

				} //


				let transparent = parameters[ 'transparent' ];
				let transparency = parameters[ 'transparency' ]; // <transparency> does not exist but <transparent>

				if ( transparency === undefined && transparent ) {

					transparency = {
						float: 1
					};

				} // <transparent> does not exist but <transparency>


				if ( transparent === undefined && transparency ) {

					transparent = {
						opaque: 'A_ONE',
						data: {
							color: [ 1, 1, 1, 1 ]
						}
					};

				}

				if ( transparent && transparency ) {

					// handle case if a texture exists but no color
					if ( transparent.data.texture ) {

						// we do not set an alpha map (see #13792)
						material.transparent = true;

					} else {

						const color = transparent.data.color;

						switch ( transparent.opaque ) {

							case 'A_ONE':
								material.opacity = color[ 3 ] * transparency.float;
								break;

							case 'RGB_ZERO':
								material.opacity = 1 - color[ 0 ] * transparency.float;
								break;

							case 'A_ZERO':
								material.opacity = 1 - color[ 3 ] * transparency.float;
								break;

							case 'RGB_ONE':
								material.opacity = color[ 0 ] * transparency.float;
								break;

							default:
								console.warn( 'THREE.ColladaLoader: Invalid opaque type "%s" of transparent tag.', transparent.opaque );

						}

						if ( material.opacity < 1 ) material.transparent = true;

					}

				} //


				if ( extra !== undefined && extra.technique !== undefined && extra.technique.double_sided === 1 ) {

					material.side = THREE.DoubleSide;

				}

				return material;

			}

			function getMaterial( id ) {

				return getBuild( library.materials[ id ], buildMaterial );

			} // camera


			function parseCamera( xml ) {

				const data = {
					name: xml.getAttribute( 'name' )
				};

				for ( let i = 0, l = xml.childNodes.length; i < l; i ++ ) {

					const child = xml.childNodes[ i ];
					if ( child.nodeType !== 1 ) continue;

					switch ( child.nodeName ) {

						case 'optics':
							data.optics = parseCameraOptics( child );
							break;

					}

				}

				library.cameras[ xml.getAttribute( 'id' ) ] = data;

			}

			function parseCameraOptics( xml ) {

				for ( let i = 0; i < xml.childNodes.length; i ++ ) {

					const child = xml.childNodes[ i ];

					switch ( child.nodeName ) {

						case 'technique_common':
							return parseCameraTechnique( child );

					}

				}

				return {};

			}

			function parseCameraTechnique( xml ) {

				const data = {};

				for ( let i = 0; i < xml.childNodes.length; i ++ ) {

					const child = xml.childNodes[ i ];

					switch ( child.nodeName ) {

						case 'perspective':
						case 'orthographic':
							data.technique = child.nodeName;
							data.parameters = parseCameraParameters( child );
							break;

					}

				}

				return data;

			}

			function parseCameraParameters( xml ) {

				const data = {};

				for ( let i = 0; i < xml.childNodes.length; i ++ ) {

					const child = xml.childNodes[ i ];

					switch ( child.nodeName ) {

						case 'xfov':
						case 'yfov':
						case 'xmag':
						case 'ymag':
						case 'znear':
						case 'zfar':
						case 'aspect_ratio':
							data[ child.nodeName ] = parseFloat( child.textContent );
							break;

					}

				}

				return data;

			}

			function buildCamera( data ) {

				let camera;

				switch ( data.optics.technique ) {

					case 'perspective':
						camera = new THREE.PerspectiveCamera( data.optics.parameters.yfov, data.optics.parameters.aspect_ratio, data.optics.parameters.znear, data.optics.parameters.zfar );
						break;

					case 'orthographic':
						let ymag = data.optics.parameters.ymag;
						let xmag = data.optics.parameters.xmag;
						const aspectRatio = data.optics.parameters.aspect_ratio;
						xmag = xmag === undefined ? ymag * aspectRatio : xmag;
						ymag = ymag === undefined ? xmag / aspectRatio : ymag;
						xmag *= 0.5;
						ymag *= 0.5;
						camera = new THREE.OrthographicCamera( - xmag, xmag, ymag, - ymag, // left, right, top, bottom
							data.optics.parameters.znear, data.optics.parameters.zfar );
						break;

					default:
						camera = new THREE.PerspectiveCamera();
						break;

				}

				camera.name = data.name || '';
				return camera;

			}

			function getCamera( id ) {

				const data = library.cameras[ id ];

				if ( data !== undefined ) {

					return getBuild( data, buildCamera );

				}

				console.warn( 'THREE.ColladaLoader: Couldn\'t find camera with ID:', id );
				return null;

			} // light


			function parseLight( xml ) {

				let data = {};

				for ( let i = 0, l = xml.childNodes.length; i < l; i ++ ) {

					const child = xml.childNodes[ i ];
					if ( child.nodeType !== 1 ) continue;

					switch ( child.nodeName ) {

						case 'technique_common':
							data = parseLightTechnique( child );
							break;

					}

				}

				library.lights[ xml.getAttribute( 'id' ) ] = data;

			}

			function parseLightTechnique( xml ) {

				const data = {};

				for ( let i = 0, l = xml.childNodes.length; i < l; i ++ ) {

					const child = xml.childNodes[ i ];
					if ( child.nodeType !== 1 ) continue;

					switch ( child.nodeName ) {

						case 'directional':
						case 'point':
						case 'spot':
						case 'ambient':
							data.technique = child.nodeName;
							data.parameters = parseLightParameters( child );

					}

				}

				return data;

			}

			function parseLightParameters( xml ) {

				const data = {};

				for ( let i = 0, l = xml.childNodes.length; i < l; i ++ ) {

					const child = xml.childNodes[ i ];
					if ( child.nodeType !== 1 ) continue;

					switch ( child.nodeName ) {

						case 'color':
							const array = parseFloats( child.textContent );
							data.color = new THREE.Color().fromArray( array );
							break;

						case 'falloff_angle':
							data.falloffAngle = parseFloat( child.textContent );
							break;

						case 'quadratic_attenuation':
							const f = parseFloat( child.textContent );
							data.distance = f ? Math.sqrt( 1 / f ) : 0;
							break;

					}

				}

				return data;

			}

			function buildLight( data ) {

				let light;

				switch ( data.technique ) {

					case 'directional':
						light = new THREE.DirectionalLight();
						break;

					case 'point':
						light = new THREE.PointLight();
						break;

					case 'spot':
						light = new THREE.SpotLight();
						break;

					case 'ambient':
						light = new THREE.AmbientLight();
						break;

				}

				if ( data.parameters.color ) light.color.copy( data.parameters.color );
				if ( data.parameters.distance ) light.distance = data.parameters.distance;
				return light;

			}

			function getLight( id ) {

				const data = library.lights[ id ];

				if ( data !== undefined ) {

					return getBuild( data, buildLight );

				}

				console.warn( 'THREE.ColladaLoader: Couldn\'t find light with ID:', id );
				return null;

			} // geometry


			function parseGeometry( xml ) {

				const data = {
					name: xml.getAttribute( 'name' ),
					sources: {},
					vertices: {},
					primitives: []
				};
				const mesh = getElementsByTagName( xml, 'mesh' )[ 0 ]; // the following tags inside geometry are not supported yet (see https://github.com/mrdoob/three.js/pull/12606): convex_mesh, spline, brep

				if ( mesh === undefined ) return;

				for ( let i = 0; i < mesh.childNodes.length; i ++ ) {

					const child = mesh.childNodes[ i ];
					if ( child.nodeType !== 1 ) continue;
					const id = child.getAttribute( 'id' );

					switch ( child.nodeName ) {

						case 'source':
							data.sources[ id ] = parseSource( child );
							break;

						case 'vertices':
							// data.sources[ id ] = data.sources[ parseId( getElementsByTagName( child, 'input' )[ 0 ].getAttribute( 'source' ) ) ];
							data.vertices = parseGeometryVertices( child );
							break;

						case 'polygons':
							console.warn( 'THREE.ColladaLoader: Unsupported primitive type: ', child.nodeName );
							break;

						case 'lines':
						case 'linestrips':
						case 'polylist':
						case 'triangles':
							data.primitives.push( parseGeometryPrimitive( child ) );
							break;

						default:
							console.log( child );

					}

				}

				library.geometries[ xml.getAttribute( 'id' ) ] = data;

			}

			function parseSource( xml ) {

				const data = {
					array: [],
					stride: 3
				};

				for ( let i = 0; i < xml.childNodes.length; i ++ ) {

					const child = xml.childNodes[ i ];
					if ( child.nodeType !== 1 ) continue;

					switch ( child.nodeName ) {

						case 'float_array':
							data.array = parseFloats( child.textContent );
							break;

						case 'Name_array':
							data.array = parseStrings( child.textContent );
							break;

						case 'technique_common':
							const accessor = getElementsByTagName( child, 'accessor' )[ 0 ];

							if ( accessor !== undefined ) {

								data.stride = parseInt( accessor.getAttribute( 'stride' ) );

							}

							break;

					}

				}

				return data;

			}

			function parseGeometryVertices( xml ) {

				const data = {};

				for ( let i = 0; i < xml.childNodes.length; i ++ ) {

					const child = xml.childNodes[ i ];
					if ( child.nodeType !== 1 ) continue;
					data[ child.getAttribute( 'semantic' ) ] = parseId( child.getAttribute( 'source' ) );

				}

				return data;

			}

			function parseGeometryPrimitive( xml ) {

				const primitive = {
					type: xml.nodeName,
					material: xml.getAttribute( 'material' ),
					count: parseInt( xml.getAttribute( 'count' ) ),
					inputs: {},
					stride: 0,
					hasUV: false
				};

				for ( let i = 0, l = xml.childNodes.length; i < l; i ++ ) {

					const child = xml.childNodes[ i ];
					if ( child.nodeType !== 1 ) continue;

					switch ( child.nodeName ) {

						case 'input':
							const id = parseId( child.getAttribute( 'source' ) );
							const semantic = child.getAttribute( 'semantic' );
							const offset = parseInt( child.getAttribute( 'offset' ) );
							const set = parseInt( child.getAttribute( 'set' ) );
							const inputname = set > 0 ? semantic + set : semantic;
							primitive.inputs[ inputname ] = {
								id: id,
								offset: offset
							};
							primitive.stride = Math.max( primitive.stride, offset + 1 );
							if ( semantic === 'TEXCOORD' ) primitive.hasUV = true;
							break;

						case 'vcount':
							primitive.vcount = parseInts( child.textContent );
							break;

						case 'p':
							primitive.p = parseInts( child.textContent );
							break;

					}

				}

				return primitive;

			}

			function groupPrimitives( primitives ) {

				const build = {};

				for ( let i = 0; i < primitives.length; i ++ ) {

					const primitive = primitives[ i ];
					if ( build[ primitive.type ] === undefined ) build[ primitive.type ] = [];
					build[ primitive.type ].push( primitive );

				}

				return build;

			}

			function checkUVCoordinates( primitives ) {

				let count = 0;

				for ( let i = 0, l = primitives.length; i < l; i ++ ) {

					const primitive = primitives[ i ];

					if ( primitive.hasUV === true ) {

						count ++;

					}

				}

				if ( count > 0 && count < primitives.length ) {

					primitives.uvsNeedsFix = true;

				}

			}

			function buildGeometry( data ) {

				const build = {};
				const sources = data.sources;
				const vertices = data.vertices;
				const primitives = data.primitives;
				if ( primitives.length === 0 ) return {}; // our goal is to create one buffer geometry for a single type of primitives
				// first, we group all primitives by their type

				const groupedPrimitives = groupPrimitives( primitives );

				for ( const type in groupedPrimitives ) {

					const primitiveType = groupedPrimitives[ type ]; // second, ensure consistent uv coordinates for each type of primitives (polylist,triangles or lines)

					checkUVCoordinates( primitiveType ); // third, create a buffer geometry for each type of primitives

					build[ type ] = buildGeometryType( primitiveType, sources, vertices );

				}

				return build;

			}

			function buildGeometryType( primitives, sources, vertices ) {

				const build = {};
				const position = {
					array: [],
					stride: 0
				};
				const normal = {
					array: [],
					stride: 0
				};
				const uv = {
					array: [],
					stride: 0
				};
				const uv2 = {
					array: [],
					stride: 0
				};
				const color = {
					array: [],
					stride: 0
				};
				const skinIndex = {
					array: [],
					stride: 4
				};
				const skinWeight = {
					array: [],
					stride: 4
				};
				const geometry = new THREE.BufferGeometry();
				const materialKeys = [];
				let start = 0;

				for ( let p = 0; p < primitives.length; p ++ ) {

					const primitive = primitives[ p ];
					const inputs = primitive.inputs; // groups

					let count = 0;

					switch ( primitive.type ) {

						case 'lines':
						case 'linestrips':
							count = primitive.count * 2;
							break;

						case 'triangles':
							count = primitive.count * 3;
							break;

						case 'polylist':
							for ( let g = 0; g < primitive.count; g ++ ) {

								const vc = primitive.vcount[ g ];

								switch ( vc ) {

									case 3:
										count += 3; // single triangle

										break;

									case 4:
										count += 6; // quad, subdivided into two triangles

										break;

									default:
										count += ( vc - 2 ) * 3; // polylist with more than four vertices

										break;

								}

							}

							break;

						default:
							console.warn( 'THREE.ColladaLoader: Unknow primitive type:', primitive.type );

					}

					geometry.addGroup( start, count, p );
					start += count; // material

					if ( primitive.material ) {

						materialKeys.push( primitive.material );

					} // geometry data


					for ( const name in inputs ) {

						const input = inputs[ name ];

						switch ( name ) {

							case 'VERTEX':
								for ( const key in vertices ) {

									const id = vertices[ key ];

									switch ( key ) {

										case 'POSITION':
											const prevLength = position.array.length;
											buildGeometryData( primitive, sources[ id ], input.offset, position.array );
											position.stride = sources[ id ].stride;

											if ( sources.skinWeights && sources.skinIndices ) {

												buildGeometryData( primitive, sources.skinIndices, input.offset, skinIndex.array );
												buildGeometryData( primitive, sources.skinWeights, input.offset, skinWeight.array );

											} // see #3803


											if ( primitive.hasUV === false && primitives.uvsNeedsFix === true ) {

												const count = ( position.array.length - prevLength ) / position.stride;

												for ( let i = 0; i < count; i ++ ) {

													// fill missing uv coordinates
													uv.array.push( 0, 0 );

												}

											}

											break;

										case 'NORMAL':
											buildGeometryData( primitive, sources[ id ], input.offset, normal.array );
											normal.stride = sources[ id ].stride;
											break;

										case 'COLOR':
											buildGeometryData( primitive, sources[ id ], input.offset, color.array );
											color.stride = sources[ id ].stride;
											break;

										case 'TEXCOORD':
											buildGeometryData( primitive, sources[ id ], input.offset, uv.array );
											uv.stride = sources[ id ].stride;
											break;

										case 'TEXCOORD1':
											buildGeometryData( primitive, sources[ id ], input.offset, uv2.array );
											uv.stride = sources[ id ].stride;
											break;

										default:
											console.warn( 'THREE.ColladaLoader: Semantic "%s" not handled in geometry build process.', key );

									}

								}

								break;

							case 'NORMAL':
								buildGeometryData( primitive, sources[ input.id ], input.offset, normal.array );
								normal.stride = sources[ input.id ].stride;
								break;

							case 'COLOR':
								buildGeometryData( primitive, sources[ input.id ], input.offset, color.array );
								color.stride = sources[ input.id ].stride;
								break;

							case 'TEXCOORD':
								buildGeometryData( primitive, sources[ input.id ], input.offset, uv.array );
								uv.stride = sources[ input.id ].stride;
								break;

							case 'TEXCOORD1':
								buildGeometryData( primitive, sources[ input.id ], input.offset, uv2.array );
								uv2.stride = sources[ input.id ].stride;
								break;

						}

					}

				} // build geometry


				if ( position.array.length > 0 ) geometry.setAttribute( 'position', new THREE.Float32BufferAttribute( position.array, position.stride ) );
				if ( normal.array.length > 0 ) geometry.setAttribute( 'normal', new THREE.Float32BufferAttribute( normal.array, normal.stride ) );
				if ( color.array.length > 0 ) geometry.setAttribute( 'color', new THREE.Float32BufferAttribute( color.array, color.stride ) );
				if ( uv.array.length > 0 ) geometry.setAttribute( 'uv', new THREE.Float32BufferAttribute( uv.array, uv.stride ) );
				if ( uv2.array.length > 0 ) geometry.setAttribute( 'uv2', new THREE.Float32BufferAttribute( uv2.array, uv2.stride ) );
				if ( skinIndex.array.length > 0 ) geometry.setAttribute( 'skinIndex', new THREE.Float32BufferAttribute( skinIndex.array, skinIndex.stride ) );
				if ( skinWeight.array.length > 0 ) geometry.setAttribute( 'skinWeight', new THREE.Float32BufferAttribute( skinWeight.array, skinWeight.stride ) );
				build.data = geometry;
				build.type = primitives[ 0 ].type;
				build.materialKeys = materialKeys;
				return build;

			}

			function buildGeometryData( primitive, source, offset, array ) {

				const indices = primitive.p;
				const stride = primitive.stride;
				const vcount = primitive.vcount;

				function pushVector( i ) {

					let index = indices[ i + offset ] * sourceStride;
					const length = index + sourceStride;

					for ( ; index < length; index ++ ) {

						array.push( sourceArray[ index ] );

					}

				}

				const sourceArray = source.array;
				const sourceStride = source.stride;

				if ( primitive.vcount !== undefined ) {

					let index = 0;

					for ( let i = 0, l = vcount.length; i < l; i ++ ) {

						const count = vcount[ i ];

						if ( count === 4 ) {

							const a = index + stride * 0;
							const b = index + stride * 1;
							const c = index + stride * 2;
							const d = index + stride * 3;
							pushVector( a );
							pushVector( b );
							pushVector( d );
							pushVector( b );
							pushVector( c );
							pushVector( d );

						} else if ( count === 3 ) {

							const a = index + stride * 0;
							const b = index + stride * 1;
							const c = index + stride * 2;
							pushVector( a );
							pushVector( b );
							pushVector( c );

						} else if ( count > 4 ) {

							for ( let k = 1, kl = count - 2; k <= kl; k ++ ) {

								const a = index + stride * 0;
								const b = index + stride * k;
								const c = index + stride * ( k + 1 );
								pushVector( a );
								pushVector( b );
								pushVector( c );

							}

						}

						index += stride * count;

					}

				} else {

					for ( let i = 0, l = indices.length; i < l; i += stride ) {

						pushVector( i );

					}

				}

			}

			function getGeometry( id ) {

				return getBuild( library.geometries[ id ], buildGeometry );

			} // kinematics


			function parseKinematicsModel( xml ) {

				const data = {
					name: xml.getAttribute( 'name' ) || '',
					joints: {},
					links: []
				};

				for ( let i = 0; i < xml.childNodes.length; i ++ ) {

					const child = xml.childNodes[ i ];
					if ( child.nodeType !== 1 ) continue;

					switch ( child.nodeName ) {

						case 'technique_common':
							parseKinematicsTechniqueCommon( child, data );
							break;

					}

				}

				library.kinematicsModels[ xml.getAttribute( 'id' ) ] = data;

			}

			function buildKinematicsModel( data ) {

				if ( data.build !== undefined ) return data.build;
				return data;

			}

			function getKinematicsModel( id ) {

				return getBuild( library.kinematicsModels[ id ], buildKinematicsModel );

			}

			function parseKinematicsTechniqueCommon( xml, data ) {

				for ( let i = 0; i < xml.childNodes.length; i ++ ) {

					const child = xml.childNodes[ i ];
					if ( child.nodeType !== 1 ) continue;

					switch ( child.nodeName ) {

						case 'joint':
							data.joints[ child.getAttribute( 'sid' ) ] = parseKinematicsJoint( child );
							break;

						case 'link':
							data.links.push( parseKinematicsLink( child ) );
							break;

					}

				}

			}

			function parseKinematicsJoint( xml ) {

				let data;

				for ( let i = 0; i < xml.childNodes.length; i ++ ) {

					const child = xml.childNodes[ i ];
					if ( child.nodeType !== 1 ) continue;

					switch ( child.nodeName ) {

						case 'prismatic':
						case 'revolute':
							data = parseKinematicsJointParameter( child );
							break;

					}

				}

				return data;

			}

			function parseKinematicsJointParameter( xml ) {

				const data = {
					sid: xml.getAttribute( 'sid' ),
					name: xml.getAttribute( 'name' ) || '',
					axis: new THREE.Vector3(),
					limits: {
						min: 0,
						max: 0
					},
					type: xml.nodeName,
					static: false,
					zeroPosition: 0,
					middlePosition: 0
				};

				for ( let i = 0; i < xml.childNodes.length; i ++ ) {

					const child = xml.childNodes[ i ];
					if ( child.nodeType !== 1 ) continue;

					switch ( child.nodeName ) {

						case 'axis':
							const array = parseFloats( child.textContent );
							data.axis.fromArray( array );
							break;

						case 'limits':
							const max = child.getElementsByTagName( 'max' )[ 0 ];
							const min = child.getElementsByTagName( 'min' )[ 0 ];
							data.limits.max = parseFloat( max.textContent );
							data.limits.min = parseFloat( min.textContent );
							break;

					}

				} // if min is equal to or greater than max, consider the joint static


				if ( data.limits.min >= data.limits.max ) {

					data.static = true;

				} // calculate middle position


				data.middlePosition = ( data.limits.min + data.limits.max ) / 2.0;
				return data;

			}

			function parseKinematicsLink( xml ) {

				const data = {
					sid: xml.getAttribute( 'sid' ),
					name: xml.getAttribute( 'name' ) || '',
					attachments: [],
					transforms: []
				};

				for ( let i = 0; i < xml.childNodes.length; i ++ ) {

					const child = xml.childNodes[ i ];
					if ( child.nodeType !== 1 ) continue;

					switch ( child.nodeName ) {

						case 'attachment_full':
							data.attachments.push( parseKinematicsAttachment( child ) );
							break;

						case 'matrix':
						case 'translate':
						case 'rotate':
							data.transforms.push( parseKinematicsTransform( child ) );
							break;

					}

				}

				return data;

			}

			function parseKinematicsAttachment( xml ) {

				const data = {
					joint: xml.getAttribute( 'joint' ).split( '/' ).pop(),
					transforms: [],
					links: []
				};

				for ( let i = 0; i < xml.childNodes.length; i ++ ) {

					const child = xml.childNodes[ i ];
					if ( child.nodeType !== 1 ) continue;

					switch ( child.nodeName ) {

						case 'link':
							data.links.push( parseKinematicsLink( child ) );
							break;

						case 'matrix':
						case 'translate':
						case 'rotate':
							data.transforms.push( parseKinematicsTransform( child ) );
							break;

					}

				}

				return data;

			}

			function parseKinematicsTransform( xml ) {

				const data = {
					type: xml.nodeName
				};
				const array = parseFloats( xml.textContent );

				switch ( data.type ) {

					case 'matrix':
						data.obj = new THREE.Matrix4();
						data.obj.fromArray( array ).transpose();
						break;

					case 'translate':
						data.obj = new THREE.Vector3();
						data.obj.fromArray( array );
						break;

					case 'rotate':
						data.obj = new THREE.Vector3();
						data.obj.fromArray( array );
						data.angle = THREE.MathUtils.degToRad( array[ 3 ] );
						break;

				}

				return data;

			} // physics


			function parsePhysicsModel( xml ) {

				const data = {
					name: xml.getAttribute( 'name' ) || '',
					rigidBodies: {}
				};

				for ( let i = 0; i < xml.childNodes.length; i ++ ) {

					const child = xml.childNodes[ i ];
					if ( child.nodeType !== 1 ) continue;

					switch ( child.nodeName ) {

						case 'rigid_body':
							data.rigidBodies[ child.getAttribute( 'name' ) ] = {};
							parsePhysicsRigidBody( child, data.rigidBodies[ child.getAttribute( 'name' ) ] );
							break;

					}

				}

				library.physicsModels[ xml.getAttribute( 'id' ) ] = data;

			}

			function parsePhysicsRigidBody( xml, data ) {

				for ( let i = 0; i < xml.childNodes.length; i ++ ) {

					const child = xml.childNodes[ i ];
					if ( child.nodeType !== 1 ) continue;

					switch ( child.nodeName ) {

						case 'technique_common':
							parsePhysicsTechniqueCommon( child, data );
							break;

					}

				}

			}

			function parsePhysicsTechniqueCommon( xml, data ) {

				for ( let i = 0; i < xml.childNodes.length; i ++ ) {

					const child = xml.childNodes[ i ];
					if ( child.nodeType !== 1 ) continue;

					switch ( child.nodeName ) {

						case 'inertia':
							data.inertia = parseFloats( child.textContent );
							break;

						case 'mass':
							data.mass = parseFloats( child.textContent )[ 0 ];
							break;

					}

				}

			} // scene


			function parseKinematicsScene( xml ) {

				const data = {
					bindJointAxis: []
				};

				for ( let i = 0; i < xml.childNodes.length; i ++ ) {

					const child = xml.childNodes[ i ];
					if ( child.nodeType !== 1 ) continue;

					switch ( child.nodeName ) {

						case 'bind_joint_axis':
							data.bindJointAxis.push( parseKinematicsBindJointAxis( child ) );
							break;

					}

				}

				library.kinematicsScenes[ parseId( xml.getAttribute( 'url' ) ) ] = data;

			}

			function parseKinematicsBindJointAxis( xml ) {

				const data = {
					target: xml.getAttribute( 'target' ).split( '/' ).pop()
				};

				for ( let i = 0; i < xml.childNodes.length; i ++ ) {

					const child = xml.childNodes[ i ];
					if ( child.nodeType !== 1 ) continue;

					switch ( child.nodeName ) {

						case 'axis':
							const param = child.getElementsByTagName( 'param' )[ 0 ];
							data.axis = param.textContent;
							const tmpJointIndex = data.axis.split( 'inst_' ).pop().split( 'axis' )[ 0 ];
							data.jointIndex = tmpJointIndex.substr( 0, tmpJointIndex.length - 1 );
							break;

					}

				}

				return data;

			}

			function buildKinematicsScene( data ) {

				if ( data.build !== undefined ) return data.build;
				return data;

			}

			function getKinematicsScene( id ) {

				return getBuild( library.kinematicsScenes[ id ], buildKinematicsScene );

			}

			function setupKinematics() {

				const kinematicsModelId = Object.keys( library.kinematicsModels )[ 0 ];
				const kinematicsSceneId = Object.keys( library.kinematicsScenes )[ 0 ];
				const visualSceneId = Object.keys( library.visualScenes )[ 0 ];
				if ( kinematicsModelId === undefined || kinematicsSceneId === undefined ) return;
				const kinematicsModel = getKinematicsModel( kinematicsModelId );
				const kinematicsScene = getKinematicsScene( kinematicsSceneId );
				const visualScene = getVisualScene( visualSceneId );
				const bindJointAxis = kinematicsScene.bindJointAxis;
				const jointMap = {};

				for ( let i = 0, l = bindJointAxis.length; i < l; i ++ ) {

					const axis = bindJointAxis[ i ]; // the result of the following query is an element of type 'translate', 'rotate','scale' or 'matrix'

					const targetElement = collada.querySelector( '[sid="' + axis.target + '"]' );

					if ( targetElement ) {

						// get the parent of the transform element
						const parentVisualElement = targetElement.parentElement; // connect the joint of the kinematics model with the element in the visual scene

						connect( axis.jointIndex, parentVisualElement );

					}

				}

				function connect( jointIndex, visualElement ) {

					const visualElementName = visualElement.getAttribute( 'name' );
					const joint = kinematicsModel.joints[ jointIndex ];
					visualScene.traverse( function ( object ) {

						if ( object.name === visualElementName ) {

							jointMap[ jointIndex ] = {
								object: object,
								transforms: buildTransformList( visualElement ),
								joint: joint,
								position: joint.zeroPosition
							};

						}

					} );

				}

				const m0 = new THREE.Matrix4();
				kinematics = {
					joints: kinematicsModel && kinematicsModel.joints,
					getJointValue: function ( jointIndex ) {

						const jointData = jointMap[ jointIndex ];

						if ( jointData ) {

							return jointData.position;

						} else {

							console.warn( 'THREE.ColladaLoader: Joint ' + jointIndex + ' doesn\'t exist.' );

						}

					},
					setJointValue: function ( jointIndex, value ) {

						const jointData = jointMap[ jointIndex ];

						if ( jointData ) {

							const joint = jointData.joint;

							if ( value > joint.limits.max || value < joint.limits.min ) {

								console.warn( 'THREE.ColladaLoader: Joint ' + jointIndex + ' value ' + value + ' outside of limits (min: ' + joint.limits.min + ', max: ' + joint.limits.max + ').' );

							} else if ( joint.static ) {

								console.warn( 'THREE.ColladaLoader: Joint ' + jointIndex + ' is static.' );

							} else {

								const object = jointData.object;
								const axis = joint.axis;
								const transforms = jointData.transforms;
								matrix.identity(); // each update, we have to apply all transforms in the correct order

								for ( let i = 0; i < transforms.length; i ++ ) {

									const transform = transforms[ i ]; // if there is a connection of the transform node with a joint, apply the joint value

									if ( transform.sid && transform.sid.indexOf( jointIndex ) !== - 1 ) {

										switch ( joint.type ) {

											case 'revolute':
												matrix.multiply( m0.makeRotationAxis( axis, THREE.MathUtils.degToRad( value ) ) );
												break;

											case 'prismatic':
												matrix.multiply( m0.makeTranslation( axis.x * value, axis.y * value, axis.z * value ) );
												break;

											default:
												console.warn( 'THREE.ColladaLoader: Unknown joint type: ' + joint.type );
												break;

										}

									} else {

										switch ( transform.type ) {

											case 'matrix':
												matrix.multiply( transform.obj );
												break;

											case 'translate':
												matrix.multiply( m0.makeTranslation( transform.obj.x, transform.obj.y, transform.obj.z ) );
												break;

											case 'scale':
												matrix.scale( transform.obj );
												break;

											case 'rotate':
												matrix.multiply( m0.makeRotationAxis( transform.obj, transform.angle ) );
												break;

										}

									}

								}

								object.matrix.copy( matrix );
								object.matrix.decompose( object.position, object.quaternion, object.scale );
								jointMap[ jointIndex ].position = value;

							}

						} else {

							console.log( 'THREE.ColladaLoader: ' + jointIndex + ' does not exist.' );

						}

					}
				};

			}

			function buildTransformList( node ) {

				const transforms = [];
				const xml = collada.querySelector( '[id="' + node.id + '"]' );

				for ( let i = 0; i < xml.childNodes.length; i ++ ) {

					const child = xml.childNodes[ i ];
					if ( child.nodeType !== 1 ) continue;
					let array, vector;

					switch ( child.nodeName ) {

						case 'matrix':
							array = parseFloats( child.textContent );
							const matrix = new THREE.Matrix4().fromArray( array ).transpose();
							transforms.push( {
								sid: child.getAttribute( 'sid' ),
								type: child.nodeName,
								obj: matrix
							} );
							break;

						case 'translate':
						case 'scale':
							array = parseFloats( child.textContent );
							vector = new THREE.Vector3().fromArray( array );
							transforms.push( {
								sid: child.getAttribute( 'sid' ),
								type: child.nodeName,
								obj: vector
							} );
							break;

						case 'rotate':
							array = parseFloats( child.textContent );
							vector = new THREE.Vector3().fromArray( array );
							const angle = THREE.MathUtils.degToRad( array[ 3 ] );
							transforms.push( {
								sid: child.getAttribute( 'sid' ),
								type: child.nodeName,
								obj: vector,
								angle: angle
							} );
							break;

					}

				}

				return transforms;

			} // nodes


			function prepareNodes( xml ) {

				const elements = xml.getElementsByTagName( 'node' ); // ensure all node elements have id attributes

				for ( let i = 0; i < elements.length; i ++ ) {

					const element = elements[ i ];

					if ( element.hasAttribute( 'id' ) === false ) {

						element.setAttribute( 'id', generateId() );

					}

				}

			}

			const matrix = new THREE.Matrix4();
			const vector = new THREE.Vector3();

			function parseNode( xml ) {

				const data = {
					name: xml.getAttribute( 'name' ) || '',
					type: xml.getAttribute( 'type' ),
					id: xml.getAttribute( 'id' ),
					sid: xml.getAttribute( 'sid' ),
					matrix: new THREE.Matrix4(),
					nodes: [],
					instanceCameras: [],
					instanceControllers: [],
					instanceLights: [],
					instanceGeometries: [],
					instanceNodes: [],
					transforms: {}
				};

				for ( let i = 0; i < xml.childNodes.length; i ++ ) {

					const child = xml.childNodes[ i ];
					if ( child.nodeType !== 1 ) continue;
					let array;

					switch ( child.nodeName ) {

						case 'node':
							data.nodes.push( child.getAttribute( 'id' ) );
							parseNode( child );
							break;

						case 'instance_camera':
							data.instanceCameras.push( parseId( child.getAttribute( 'url' ) ) );
							break;

						case 'instance_controller':
							data.instanceControllers.push( parseNodeInstance( child ) );
							break;

						case 'instance_light':
							data.instanceLights.push( parseId( child.getAttribute( 'url' ) ) );
							break;

						case 'instance_geometry':
							data.instanceGeometries.push( parseNodeInstance( child ) );
							break;

						case 'instance_node':
							data.instanceNodes.push( parseId( child.getAttribute( 'url' ) ) );
							break;

						case 'matrix':
							array = parseFloats( child.textContent );
							data.matrix.multiply( matrix.fromArray( array ).transpose() );
							data.transforms[ child.getAttribute( 'sid' ) ] = child.nodeName;
							break;

						case 'translate':
							array = parseFloats( child.textContent );
							vector.fromArray( array );
							data.matrix.multiply( matrix.makeTranslation( vector.x, vector.y, vector.z ) );
							data.transforms[ child.getAttribute( 'sid' ) ] = child.nodeName;
							break;

						case 'rotate':
							array = parseFloats( child.textContent );
							const angle = THREE.MathUtils.degToRad( array[ 3 ] );
							data.matrix.multiply( matrix.makeRotationAxis( vector.fromArray( array ), angle ) );
							data.transforms[ child.getAttribute( 'sid' ) ] = child.nodeName;
							break;

						case 'scale':
							array = parseFloats( child.textContent );
							data.matrix.scale( vector.fromArray( array ) );
							data.transforms[ child.getAttribute( 'sid' ) ] = child.nodeName;
							break;

						case 'extra':
							break;

						default:
							console.log( child );

					}

				}

				if ( hasNode( data.id ) ) {

					console.warn( 'THREE.ColladaLoader: There is already a node with ID %s. Exclude current node from further processing.', data.id );

				} else {

					library.nodes[ data.id ] = data;

				}

				return data;

			}

			function parseNodeInstance( xml ) {

				const data = {
					id: parseId( xml.getAttribute( 'url' ) ),
					materials: {},
					skeletons: []
				};

				for ( let i = 0; i < xml.childNodes.length; i ++ ) {

					const child = xml.childNodes[ i ];

					switch ( child.nodeName ) {

						case 'bind_material':
							const instances = child.getElementsByTagName( 'instance_material' );

							for ( let j = 0; j < instances.length; j ++ ) {

								const instance = instances[ j ];
								const symbol = instance.getAttribute( 'symbol' );
								const target = instance.getAttribute( 'target' );
								data.materials[ symbol ] = parseId( target );

							}

							break;

						case 'skeleton':
							data.skeletons.push( parseId( child.textContent ) );
							break;

						default:
							break;

					}

				}

				return data;

			}

			function buildSkeleton( skeletons, joints ) {

				const boneData = [];
				const sortedBoneData = [];
				let i, j, data; // a skeleton can have multiple root bones. collada expresses this
				// situtation with multiple "skeleton" tags per controller instance

				for ( i = 0; i < skeletons.length; i ++ ) {

					const skeleton = skeletons[ i ];
					let root;

					if ( hasNode( skeleton ) ) {

						root = getNode( skeleton );
						buildBoneHierarchy( root, joints, boneData );

					} else if ( hasVisualScene( skeleton ) ) {

						// handle case where the skeleton refers to the visual scene (#13335)
						const visualScene = library.visualScenes[ skeleton ];
						const children = visualScene.children;

						for ( let j = 0; j < children.length; j ++ ) {

							const child = children[ j ];

							if ( child.type === 'JOINT' ) {

								const root = getNode( child.id );
								buildBoneHierarchy( root, joints, boneData );

							}

						}

					} else {

						console.error( 'THREE.ColladaLoader: Unable to find root bone of skeleton with ID:', skeleton );

					}

				} // sort bone data (the order is defined in the corresponding controller)


				for ( i = 0; i < joints.length; i ++ ) {

					for ( j = 0; j < boneData.length; j ++ ) {

						data = boneData[ j ];

						if ( data.bone.name === joints[ i ].name ) {

							sortedBoneData[ i ] = data;
							data.processed = true;
							break;

						}

					}

				} // add unprocessed bone data at the end of the list


				for ( i = 0; i < boneData.length; i ++ ) {

					data = boneData[ i ];

					if ( data.processed === false ) {

						sortedBoneData.push( data );
						data.processed = true;

					}

				} // setup arrays for skeleton creation


				const bones = [];
				const boneInverses = [];

				for ( i = 0; i < sortedBoneData.length; i ++ ) {

					data = sortedBoneData[ i ];
					bones.push( data.bone );
					boneInverses.push( data.boneInverse );

				}

				return new THREE.Skeleton( bones, boneInverses );

			}

			function buildBoneHierarchy( root, joints, boneData ) {

				// setup bone data from visual scene
				root.traverse( function ( object ) {

					if ( object.isBone === true ) {

						let boneInverse; // retrieve the boneInverse from the controller data

						for ( let i = 0; i < joints.length; i ++ ) {

							const joint = joints[ i ];

							if ( joint.name === object.name ) {

								boneInverse = joint.boneInverse;
								break;

							}

						}

						if ( boneInverse === undefined ) {

							// Unfortunately, there can be joints in the visual scene that are not part of the
							// corresponding controller. In this case, we have to create a dummy boneInverse matrix
							// for the respective bone. This bone won't affect any vertices, because there are no skin indices
							// and weights defined for it. But we still have to add the bone to the sorted bone list in order to
							// ensure a correct animation of the model.
							boneInverse = new THREE.Matrix4();

						}

						boneData.push( {
							bone: object,
							boneInverse: boneInverse,
							processed: false
						} );

					}

				} );

			}

			function buildNode( data ) {

				const objects = [];
				const matrix = data.matrix;
				const nodes = data.nodes;
				const type = data.type;
				const instanceCameras = data.instanceCameras;
				const instanceControllers = data.instanceControllers;
				const instanceLights = data.instanceLights;
				const instanceGeometries = data.instanceGeometries;
				const instanceNodes = data.instanceNodes; // nodes

				for ( let i = 0, l = nodes.length; i < l; i ++ ) {

					objects.push( getNode( nodes[ i ] ) );

				} // instance cameras


				for ( let i = 0, l = instanceCameras.length; i < l; i ++ ) {

					const instanceCamera = getCamera( instanceCameras[ i ] );

					if ( instanceCamera !== null ) {

						objects.push( instanceCamera.clone() );

					}

				} // instance controllers


				for ( let i = 0, l = instanceControllers.length; i < l; i ++ ) {

					const instance = instanceControllers[ i ];
					const controller = getController( instance.id );
					const geometries = getGeometry( controller.id );
					const newObjects = buildObjects( geometries, instance.materials );
					const skeletons = instance.skeletons;
					const joints = controller.skin.joints;
					const skeleton = buildSkeleton( skeletons, joints );

					for ( let j = 0, jl = newObjects.length; j < jl; j ++ ) {

						const object = newObjects[ j ];

						if ( object.isSkinnedMesh ) {

							object.bind( skeleton, controller.skin.bindMatrix );
							object.normalizeSkinWeights();

						}

						objects.push( object );

					}

				} // instance lights


				for ( let i = 0, l = instanceLights.length; i < l; i ++ ) {

					const instanceLight = getLight( instanceLights[ i ] );

					if ( instanceLight !== null ) {

						objects.push( instanceLight.clone() );

					}

				} // instance geometries


				for ( let i = 0, l = instanceGeometries.length; i < l; i ++ ) {

					const instance = instanceGeometries[ i ]; // a single geometry instance in collada can lead to multiple object3Ds.
					// this is the case when primitives are combined like triangles and lines

					const geometries = getGeometry( instance.id );
					const newObjects = buildObjects( geometries, instance.materials );

					for ( let j = 0, jl = newObjects.length; j < jl; j ++ ) {

						objects.push( newObjects[ j ] );

					}

				} // instance nodes


				for ( let i = 0, l = instanceNodes.length; i < l; i ++ ) {

					objects.push( getNode( instanceNodes[ i ] ).clone() );

				}

				let object;

				if ( nodes.length === 0 && objects.length === 1 ) {

					object = objects[ 0 ];

				} else {

					object = type === 'JOINT' ? new THREE.Bone() : new THREE.Group();

					for ( let i = 0; i < objects.length; i ++ ) {

						object.add( objects[ i ] );

					}

				}

				object.name = type === 'JOINT' ? data.sid : data.name;
				object.matrix.copy( matrix );
				object.matrix.decompose( object.position, object.quaternion, object.scale );
				return object;

			}

			const fallbackMaterial = new THREE.MeshBasicMaterial( {
				color: 0xff00ff
			} );

			function resolveMaterialBinding( keys, instanceMaterials ) {

				const materials = [];

				for ( let i = 0, l = keys.length; i < l; i ++ ) {

					const id = instanceMaterials[ keys[ i ] ];

					if ( id === undefined ) {

						console.warn( 'THREE.ColladaLoader: Material with key %s not found. Apply fallback material.', keys[ i ] );
						materials.push( fallbackMaterial );

					} else {

						materials.push( getMaterial( id ) );

					}

				}

				return materials;

			}

			function buildObjects( geometries, instanceMaterials ) {

				const objects = [];

				for ( const type in geometries ) {

					const geometry = geometries[ type ];
					const materials = resolveMaterialBinding( geometry.materialKeys, instanceMaterials ); // handle case if no materials are defined

					if ( materials.length === 0 ) {

						if ( type === 'lines' || type === 'linestrips' ) {

							materials.push( new THREE.LineBasicMaterial() );

						} else {

							materials.push( new THREE.MeshPhongMaterial() );

						}

					} // regard skinning


					const skinning = geometry.data.attributes.skinIndex !== undefined; // choose between a single or multi materials (material array)

					const material = materials.length === 1 ? materials[ 0 ] : materials; // now create a specific 3D object

					let object;

					switch ( type ) {

						case 'lines':
							object = new THREE.LineSegments( geometry.data, material );
							break;

						case 'linestrips':
							object = new THREE.Line( geometry.data, material );
							break;

						case 'triangles':
						case 'polylist':
							if ( skinning ) {

								object = new THREE.SkinnedMesh( geometry.data, material );

							} else {

								object = new THREE.Mesh( geometry.data, material );

							}

							break;

					}

					objects.push( object );

				}

				return objects;

			}

			function hasNode( id ) {

				return library.nodes[ id ] !== undefined;

			}

			function getNode( id ) {

				return getBuild( library.nodes[ id ], buildNode );

			} // visual scenes


			function parseVisualScene( xml ) {

				const data = {
					name: xml.getAttribute( 'name' ),
					children: []
				};
				prepareNodes( xml );
				const elements = getElementsByTagName( xml, 'node' );

				for ( let i = 0; i < elements.length; i ++ ) {

					data.children.push( parseNode( elements[ i ] ) );

				}

				library.visualScenes[ xml.getAttribute( 'id' ) ] = data;

			}

			function buildVisualScene( data ) {

				const group = new THREE.Group();
				group.name = data.name;
				const children = data.children;

				for ( let i = 0; i < children.length; i ++ ) {

					const child = children[ i ];
					group.add( getNode( child.id ) );

				}

				return group;

			}

			function hasVisualScene( id ) {

				return library.visualScenes[ id ] !== undefined;

			}

			function getVisualScene( id ) {

				return getBuild( library.visualScenes[ id ], buildVisualScene );

			} // scenes


			function parseScene( xml ) {

				const instance = getElementsByTagName( xml, 'instance_visual_scene' )[ 0 ];
				return getVisualScene( parseId( instance.getAttribute( 'url' ) ) );

			}

			function setupAnimations() {

				const clips = library.clips;

				if ( isEmpty( clips ) === true ) {

					if ( isEmpty( library.animations ) === false ) {

						// if there are animations but no clips, we create a default clip for playback
						const tracks = [];

						for ( const id in library.animations ) {

							const animationTracks = getAnimation( id );

							for ( let i = 0, l = animationTracks.length; i < l; i ++ ) {

								tracks.push( animationTracks[ i ] );

							}

						}

						animations.push( new THREE.AnimationClip( 'default', - 1, tracks ) );

					}

				} else {

					for ( const id in clips ) {

						animations.push( getAnimationClip( id ) );

					}

				}

			} // convert the parser error element into text with each child elements text
			// separated by new lines.


			function parserErrorToText( parserError ) {

				let result = '';
				const stack = [ parserError ];

				while ( stack.length ) {

					const node = stack.shift();

					if ( node.nodeType === Node.TEXT_NODE ) {

						result += node.textContent;

					} else {

						result += '\n';
						stack.push.apply( stack, node.childNodes );

					}

				}

				return result.trim();

			}

			if ( text.length === 0 ) {

				return {
					scene: new THREE.Scene()
				};

			}

			const xml = new DOMParser().parseFromString( text, 'application/xml' );
			const collada = getElementsByTagName( xml, 'COLLADA' )[ 0 ];
			const parserError = xml.getElementsByTagName( 'parsererror' )[ 0 ];

			if ( parserError !== undefined ) {

				// Chrome will return parser error with a div in it
				const errorElement = getElementsByTagName( parserError, 'div' )[ 0 ];
				let errorText;

				if ( errorElement ) {

					errorText = errorElement.textContent;

				} else {

					errorText = parserErrorToText( parserError );

				}

				console.error( 'THREE.ColladaLoader: Failed to parse collada file.\n', errorText );
				return null;

			} // metadata


			const version = collada.getAttribute( 'version' );
			console.log( 'THREE.ColladaLoader: File version', version );
			const asset = parseAsset( getElementsByTagName( collada, 'asset' )[ 0 ] );
			const textureLoader = new THREE.TextureLoader( this.manager );
			textureLoader.setPath( this.resourcePath || path ).setCrossOrigin( this.crossOrigin );
			let tgaLoader;

			if ( THREE.TGALoader ) {

				tgaLoader = new THREE.TGALoader( this.manager );
				tgaLoader.setPath( this.resourcePath || path );

			} //


			const animations = [];
			let kinematics = {};
			let count = 0; //

			const library = {
				animations: {},
				clips: {},
				controllers: {},
				images: {},
				effects: {},
				materials: {},
				cameras: {},
				lights: {},
				geometries: {},
				nodes: {},
				visualScenes: {},
				kinematicsModels: {},
				physicsModels: {},
				kinematicsScenes: {}
			};
			parseLibrary( collada, 'library_animations', 'animation', parseAnimation );
			parseLibrary( collada, 'library_animation_clips', 'animation_clip', parseAnimationClip );
			parseLibrary( collada, 'library_controllers', 'controller', parseController );
			parseLibrary( collada, 'library_images', 'image', parseImage );
			parseLibrary( collada, 'library_effects', 'effect', parseEffect );
			parseLibrary( collada, 'library_materials', 'material', parseMaterial );
			parseLibrary( collada, 'library_cameras', 'camera', parseCamera );
			parseLibrary( collada, 'library_lights', 'light', parseLight );
			parseLibrary( collada, 'library_geometries', 'geometry', parseGeometry );
			parseLibrary( collada, 'library_nodes', 'node', parseNode );
			parseLibrary( collada, 'library_visual_scenes', 'visual_scene', parseVisualScene );
			parseLibrary( collada, 'library_kinematics_models', 'kinematics_model', parseKinematicsModel );
			parseLibrary( collada, 'library_physics_models', 'physics_model', parsePhysicsModel );
			parseLibrary( collada, 'scene', 'instance_kinematics_scene', parseKinematicsScene );
			buildLibrary( library.animations, buildAnimation );
			buildLibrary( library.clips, buildAnimationClip );
			buildLibrary( library.controllers, buildController );
			buildLibrary( library.images, buildImage );
			buildLibrary( library.effects, buildEffect );
			buildLibrary( library.materials, buildMaterial );
			buildLibrary( library.cameras, buildCamera );
			buildLibrary( library.lights, buildLight );
			buildLibrary( library.geometries, buildGeometry );
			buildLibrary( library.visualScenes, buildVisualScene );
			setupAnimations();
			setupKinematics();
			const scene = parseScene( getElementsByTagName( collada, 'scene' )[ 0 ] );
			scene.animations = animations;

			if ( asset.upAxis === 'Z_UP' ) {

				scene.quaternion.setFromEuler( new THREE.Euler( - Math.PI / 2, 0, 0 ) );

			}

			scene.scale.multiplyScalar( asset.unit );
			return {
				get animations() {

					console.warn( 'THREE.ColladaLoader: Please access animations over scene.animations now.' );
					return animations;

				},

				kinematics: kinematics,
				library: library,
				scene: scene
			};

		}

	}

	THREE.ColladaLoader = ColladaLoader;

} )();
